Duplicate Address Detection for Time-Oriented Care-of address using Lookup Table

• Main Authors: Yao-Kai Chan, 詹堯凱
• Other Authors: Shang-Juh Kao
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/06090778591607757882

碩士 === 中興大學 === 資訊網路多媒體研究所 === 99 === As in Mobile IPv6 (MIPv6) and Fast Handovers for Mobile IPv6 (FMIPv6) networks, the time-consuming Duplicate Address Detection (DAD) may result in packets loss and service disconnection. In this thesis, we propose a Time-oriented Care-of Address (TOCoA) generation scheme and use the care-of address table lookup mechanism to speed up the DAD processing. Since the CoA collision may result in unexpected packet re-transmission, the proposed TOCoA replaces the conventional EUI-64 address by embedding timestamp the new CoA to reduce the collision occurrences. While a collision is detected, the MN is re-assigned a CoA by decrementing the timestamp by one until no collision occur. As the execution of DAD in both MIPv6 and FMIPv6 may take 1000 ms, which is the largest part of the handover procedure, by adopting table lookup mechanism, this time can be shortened to be less than 100ms. The packet delay time of the proposed mechanism can be reduced to 549ms, as opposed to more than 2200ms in both MIPv6 and FMIPv6.